JPS6349575B2 - - Google Patents

Abstract

A forming machine to form a sheet of metal to an "S" bend having clamps (2,5) to clamp the sheet metal, the clamp (5) having an anvil (10) about which the sheet metal is folded by a rotatable forming bar (20) to form a first channel (11) and partially form a second channel (35) in the sheet metal after which the rotatable bar (20) is moved clear and a nose (24) on a further former (20) further folds the second channel (35) facing in the opposite direction to the first channel (11).

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method and apparatus for forming an S-shaped feature in a metal sheet. Such an S-shape is provided, for example, in order to prevent stress concentration in the bent portion of a refrigerator case.Other advantages of having such an S-shape are disclosed in, for example, US Pat. No. 4,348,068. Specification and U.S. Patent No.
It is disclosed in the specification of No. 4358213.

(Prior Art) The aforementioned S-shaped formation is shown in a perspective view in FIG. The S-shaped forming part is attached to the metal sheet 12, 1
One recess 11 and another recess 35 facing in the opposite direction to the recess 11 are formed adjacent to each other. In the prior art, forming such an S-shaped feature into a metal sheet required manual work or special rolling equipment.

(Problems to be Solved by the Invention) However, preparing such a special rolling forming apparatus is expensive. Furthermore, if the S-shaped portion is formed manually, productivity is poor.
It is an object of the present invention to provide a method and apparatus for forming S-shaped features in sheet metal quickly and economically using relatively simple equipment.

SUMMARY OF THE INVENTION The present invention is a method of forming an S-shaped feature in a metal sheet, comprising: defining the contour of one recess of said S-shaped feature and fixing it during a subsequent forming step; positioning and clamping a metal sheet against an anvil which remains in position; and rotating a forming rod around said anvil to conform a portion of the metal sheet to the shape of said anvil and further portions of the metal sheet. a step of moving the molded rod so that it comes into contact with the tip of another molded rod while the molded rod is rotating; a step of rotating the rotatable molded rod and separating it from the tip of the other molded rod; moving the tip of a forming rod toward the anvil to form a second recess in a further portion of the metal sheet in a direction opposite to the recess, forming a generally S-shaped formation in the metal sheet; It is characterized by being .

The invention further provides an apparatus for forming an S-shaped feature in a metal sheet, the apparatus comprising: an apparatus for forming an S-shaped feature in a metal sheet; a clamping device for positioning and holding; a rotatable forming rod forming a first recess in the metal sheet by bending the metal sheet to conform to the shape of the anvil; and a rotatable forming rod for forming a first recess in the metal sheet; a movable forming rod having a tip that is movable relative to the anvil and that cooperates with the anvil to form a second recess in an opposite direction to the first recess; a rotating means for rotating said rotatable forming rod and returning it to a rest position again; and a moving means for moving said movable forming rod from a rest position and returning it again to a rest position; is clamped by the clamping device, and the first recess is formed in a portion of the metal sheet by rotating the rotatable forming rod, and during this rotation, the tip of the movable forming rod is a portion of the metal sheet comes into contact with the anvil, after which the rotatable forming rod is rotated away from the tip, and the tip of the movable forming rod is moved toward the anvil to form a first recess. A second, oppositely oriented recess is formed such that the metal sheet is formed with a generally S-shaped formation.

(Function) S is applied to the metal sheet by simple operations of clamping the metal sheet, rotating the rotatable forming rod, and moving the movable forming rod.
The character-forming features are formed quickly and easily.

(Example) FIGS. 1A to 1C show an apparatus for forming an S-shaped forming part as shown in FIG.
It is a schematic diagram explaining the operation.

The device according to the invention has a frame part 18 which is partially provided with a tube 6 having a rectangular cross-section.
The frame part 18 includes a pivot 7 to which one end of a link 8 is pivotally attached. The other end of the link 8 is pivotally connected to a pivot 9 provided on the clamp device 5. A metal sheet 12 is attached to the clamp attachment 5.
In order to provide a first recess 11 in the first recess 11, an anvil 10 defining the contour of the recess 11 is integrally connected. Rotatable molded rod 1 with a predetermined shape
5 is rotatable around a center point 16 by means of cylindrical ears 17 provided at both ends thereof. Molded rod 1
5 rotates along an arc through approximately 180 degrees, as will be explained later. A further movable forming rod 20 is mounted movable by a piston rod 21 actuated by a hydraulic piston and cylinder arrangement 22. This hydraulic piston and cylinder arrangement 22 is attached to a channel member 23. The molded rod 20 has a tip 32 having a predetermined shape.

The above is an overview of the device of the present invention, and the details of this device will be additionally explained in connection with its function in the following explanation of the operation of mounting.

(1) First stage shown in FIG. 1A: As shown in FIG. They are fed from right to left in the diagram. At this time, frame part 1
8 is in a raised position, and the clamp device 5 is in a position slightly upwardly separated from the clamp device 2 provided on the base 1. Therefore, the metal sheet 12 passes between the clamping devices 5 and 2 to the left and reaches the anvil 10.
It passes under the forming rod 15, passes over the tip 33 of the forming rod 15, and comes into contact with a stopper 39 provided on the left side of the device, and its progress is stopped.

(2) Second stage shown in Figure 1B: In this stage, first the frame portion 18
is lowered as shown by the arrow d, and the metal sheet 1
2 is clamped between clamp device 5 and clamp device 2. As mentioned above, anvil 10
Since the anvil 10 is constructed integrally with the clamp device 5, the anvil 10 also descends together with the clamp device 5. At that time, the link 8 falls slightly clockwise from the state shown in Figure 1A, so the anvil 1
0 is advanced slightly to the left from its position in FIG. 1A. Next, the rotatable forming rod 15 is placed at the center point 1
6 as shown by arrow a in FIG. 1B. This rotation is caused by the above-mentioned tube ear 17 (first
This is carried out by a rotating means (not shown) connected to the (see figure A). The metal sheet 12 is bent around the anvil 10 by such rotation of the forming rod 15. Since the anvil 10 has a contour corresponding to the recess 11 shown in FIG. 2, the recess 11 is first formed in the folded portion of the metal sheet. When the forming rod 15 is rotated in this manner, the forming rod 15 comes into contact with another forming rod 20,
A further portion 31 of the metal sheet 12 is formed into a forming rod 15
The molded rod 20 is sandwiched between an inclined shoulder 38 that continues to the tip 33 of the molded rod 20 and an inclined shoulder 19 that continues to the tip 32 of the forming rod 20. Free end 3 of metal sheet 12
6 is positioned approximately at the position where shoulder portion 38 and shoulder portion 19 begin. In this state,
The position 37 of the metal sheet 12 is pressed against the tip 32 of the forming rod 20, and the tip 33 is pressed against the tip 32 of the forming rod 20.
2 to form the metal sheet 12 into the shape shown at 34. As will become clear later, the interaction between the tips 32 and 33 is such that the forming rod 20 is used to form the second recess 35 shown in FIG. 2 in the metal sheet 12. This has already been done at this time in preparation for moving, and the tip 3 of the forming rod 15
3 and the shoulder portion 38 is the metal sheet 1
The upright position 37 of the outer flange 24 (see FIGS. 1C and 2) of the second recess 35 relative to the free end 36 of the second recess 35 is set.

(3) Third stage shown in FIG. 1C: First, the forming rod 15 is rotated in the direction of arrow b and returned to the rest position shown in FIG. 1A.
In this way, the tip portion 33 is separated from the tip portion 32. The forming rod 20 is then moved towards the anvil 10 in the direction of the arrow c by means of a piston rod 21 of the moving means constituted by a hydraulic piston-cylinder arrangement 22. Then, the position 37 of the metal sheet 12 is located at the tip end 32.
is pressed downward toward the anvil 10,
As the second recess 35 is formed, the free end 36 of the metal sheet 12 is in the position shown in FIG.
is set. The outer flange 24 is bent by movement of the forming rod 20 in the direction of arrow c so as to be approximately perpendicular to the portion of the metal sheet 12 clamped between the clamping devices 5, 2. The forming rod 20 is then retracted, the clamping devices 5, 2 are released, and the metal sheet, on which the approximately S-shaped forming part has been formed, is removed from the device.

(Effects of the Invention) According to the present invention, by relatively simple means,
S-forming features can be formed in metal sheets very quickly and very efficiently.

[Brief explanation of the drawing]

FIG. 1 shows a schematic configuration of an embodiment of the device of the present invention, and FIG. 1A, FIG. 1B, and FIG. 1C are diagrams for explaining the operating state of this device at each stage, respectively. It is. FIG. 2 is a perspective view showing an S-shaped portion of a metal sheet formed according to the present invention. 1... Base, 2... Clamp device, 3... Roller, 4... Belt, 5... Clamp device, 6...
Tube, 7...Axis, 8...Link, 9...Axis, 1
0... Anvil, 11... Recess, 12... Metal sheet, 15... Rotatable molded rod, 16... Center point, 17... Tube ear, 18... Frame portion, 19
. . . shoulder, 20 . . . movable molded rod, 21 . 32...
...Tip portion, 33...Tip portion, 35...Second recessed portion, 36...Free end of metal sheet, 37...Rising position of outer flange, 38...Shoulder portion, 39...
Stotspa.

Claims (1)

[Scope of Claims] 1. A method for forming an S-shaped portion in a metal sheet 12, the method comprising: forming one recess 11 of the S-shaped portion;
positioning and clamping the metal sheet 12 against an anvil 10 which defines the contour of the metal sheet and remains in a fixed position during the subsequent forming process; and rotating a forming rod 15 around said anvil 10 to form the metal sheet. A portion of the metal sheet 12 is made to match the shape of the anvil 10, and a further portion of the metal sheet 12 is moved so as to come into contact with the tip 32 of another forming rod 20 while the forming rod 15 is rotating. rotating the rotatable forming rod 15 away from the tip 32; moving the tip 32 of the other forming rod 20 toward the anvil 10 in the opposite direction of the recess 11; forming a second recess 35 in a further portion of the metal sheet 12 towards the direction of the metal sheet 12, forming a generally S-shaped formation in the metal sheet 12. 2 Apparatus for forming an S-forming feature in a metal sheet 12, the apparatus positioning the metal sheet 12 relative to an anvil 10 which remains in a fixed position during forming and defines the contour of one recess 11. a rotatable forming rod 15 that forms the first recess 11 in the metal sheet 12 by bending the metal sheet 12 to match the shape of the anvil 10; and a tip 32 movable relative to the rotatable forming rod 15 and for cooperating with the anvil 10 to form a second recess 35 opposite the first recess 11. a movable forming rod 20 having a rotating means for rotating said rotatable forming rod 15 along an arc from a rest position and returning it again to a rest position; and moving means for returning it to the rest position again, the metal sheet 12 is clamped by the clamping devices 2, 5,
The first recess 11 is formed by rotating the rotatable forming rod 15 into a portion of the metal sheet 12.
is formed, and during this rotation the movable forming rod 2
A portion of the metal sheet 12 comes into contact with the tip 32 of the movable forming rod 20 , and then the rotatable forming rod 15 is rotated away from the tip 32 , and the tip 32 of the movable forming rod 20 contacts the anvil 10 . An apparatus characterized in that the second recess 35 is formed in the direction opposite to the first recess 11 by being moved toward the metal sheet 12 so that a substantially S-shaped molding part is formed in the metal sheet 12. 3. In the device according to claim 2,
The rotatable forming rod 15 has a tip 33 and an inclined shoulder 38, the movable forming rod 20 has a tip 32, and the interaction between the tips 32, 33 In preparation for moving the movable forming rod 20 to form the second recess 35, the tip 33 of the rotatable forming rod 15 and the shoulder 38 are Device characterized in that the connecting part between is adapted to set the position 37 of the outer flange 24 of said second recess 35 with respect to the free end 36 of the metal sheet 12.